linux-stable.git/tools/testing/selftests/kvm, branch v5.12.2

selftests: kvm: Check that TSC page value is small after KVM_SET_CLOCK(0)

2021-04-01T09:14:19+00:00

Add a test for the issue when KVM_SET_CLOCK(0) call could cause
TSC page value to go very big because of a signedness issue around
hv_clock->system_time.

Signed-off-by: Vitaly Kuznetsov 
Message-Id: <20210326155551.17446-3-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini

selftests: kvm: make hardware_disable_test less verbose

2021-03-30T17:07:10+00:00

hardware_disable_test produces 512 snippets like
...
 main: [511] waiting semaphore
 run_test: [511] start vcpus
 run_test: [511] all threads launched
 main: [511] waiting 368us
 main: [511] killing child

and this doesn't have much value, let's print this info with pr_debug().

Signed-off-by: Vitaly Kuznetsov 
Message-Id: <20210323104331.1354800-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini

selftests: kvm: add set_boot_cpu_id test

2021-03-18T17:55:14+00:00

Test for the KVM_SET_BOOT_CPU_ID ioctl.
Check that it correctly allows to change the BSP vcpu.

Signed-off-by: Emanuele Giuseppe Esposito 
Message-Id: <20210318151624.490861-2-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini

selftests: kvm: add _vm_ioctl

2021-03-18T17:55:14+00:00

As in kvm_ioctl and _kvm_ioctl, add
the respective _vm_ioctl for vm_ioctl.

_vm_ioctl invokes an ioctl using the vm fd,
leaving the caller to test the result.

Signed-off-by: Emanuele Giuseppe Esposito 
Message-Id: <20210318151624.490861-1-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini

selftests: kvm: add get_msr_index_features

2021-03-18T17:30:49+00:00

Test the KVM_GET_MSR_FEATURE_INDEX_LIST
and KVM_GET_MSR_INDEX_LIST ioctls.

Signed-off-by: Emanuele Giuseppe Esposito 
Message-Id: <20210318145629.486450-1-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini

selftests: kvm: Add basic Hyper-V clocksources tests

2021-03-18T15:38:58+00:00

Introduce a new selftest for Hyper-V clocksources (MSR-based reference TSC
and TSC page). As a starting point, test the following:
1) Reference TSC is 1Ghz clock.
2) Reference TSC and TSC page give the same reading.
3) TSC page gets updated upon KVM_SET_CLOCK call.
4) TSC page does not get updated when guest opted for reenlightenment.
5) Disabled TSC page doesn't get updated.

Signed-off-by: Vitaly Kuznetsov 
Message-Id: <20210318140949.1065740-1-vkuznets@redhat.com>
[Add a host-side test using TSC + KVM_GET_MSR too. - Paolo]
Signed-off-by: Paolo Bonzini

KVM: x86/xen: Add support for vCPU runstate information

2021-03-02T19:30:54+00:00

This is how Xen guests do steal time accounting. The hypervisor records
the amount of time spent in each of running/runnable/blocked/offline
states.

In the Xen accounting, a vCPU is still in state RUNSTATE_running while
in Xen for a hypercall or I/O trap, etc. Only if Xen explicitly schedules
does the state become RUNSTATE_blocked. In KVM this means that even when
the vCPU exits the kvm_run loop, the state remains RUNSTATE_running.

The VMM can explicitly set the vCPU to RUNSTATE_blocked by using the
KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT attribute, and can also use
KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST to retrospectively add a given
amount of time to the blocked state and subtract it from the running
state.

The state_entry_time corresponds to get_kvmclock_ns() at the time the
vCPU entered the current state, and the total times of all four states
should always add up to state_entry_time.

Co-developed-by: Joao Martins 
Signed-off-by: Joao Martins 
Signed-off-by: David Woodhouse 
Message-Id: <20210301125309.874953-2-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini

selftests: kvm: Mmap the entire vcpu mmap area

2021-03-02T19:30:53+00:00

The vcpu mmap area may consist of more than just the kvm_run struct.
Allocate enough space for the entire vcpu mmap area. Without this, on
x86, the PIO page, for example, will be missing.  This is problematic
when dealing with an unhandled exception from the guest as the exception
vector will be incorrectly reported as 0x0.

Message-Id: <20210210165035.3712489-1-aaronlewis@google.com>
Reviewed-by: Andrew Jones 
Co-developed-by: Steve Rutherford 
Signed-off-by: Aaron Lewis 
Signed-off-by: Paolo Bonzini

selftests: kvm: avoid uninitialized variable warning

2021-02-15T16:42:45+00:00

The variable in practice will never be uninitialized, because the
loop will always go through at least one iteration.

In case it would not, make vcpu_get_cpuid report an assertion
failure.

Signed-off-by: Paolo Bonzini

selftests: kvm: add hardware_disable test

2021-02-15T16:42:36+00:00

This test launches 512 VMs in serial and kills them after a random
amount of time.

The test was original written to exercise KVM user notifiers in
the context of1650b4ebc99d:
- KVM: Disable irq while unregistering user notifier
- https://lore.kernel.org/kvm/CACXrx53vkO=HKfwWwk+fVpvxcNjPrYmtDZ10qWxFvVX_PTGp3g@mail.gmail.com/

Recently, this test piqued my interest because it proved useful to
for AMD SNP in exercising the "in-use" pages, described in APM section
15.36.12, "Running SNP-Active Virtual Machines".

Signed-off-by: Ignacio Alvarado 
Signed-off-by: Marc Orr 
Message-Id: <20210213001452.1719001-1-marcorr@google.com>
Signed-off-by: Paolo Bonzini